Safety lock for an electrical plug



FIG. 1 is a perspective view from the front of a safety lock for an electrical plug, showing my new design;

FIG. 2 is a perspective view from the rear thereof;

FIG. 3 is a top plan view thereof; the bottom view being similar;

FIG. 4 is a front elevational view thereof; and

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a safety lock for an electrical plug, as shown and described. 